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📰 Dev.to · Deva

11 articles · Updated every 3 hours · View all reads

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StaticFiles html=True at / will silently eat every API route you have
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 1mo ago
StaticFiles html=True at / will silently eat every API route you have
Zero API routes reachable. That was the state of my dashboard the moment the static directory...
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Adding a Live Generate Button: Why Synchronous Beat a Job Queue
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 1mo ago
Adding a Live Generate Button: Why Synchronous Beat a Job Queue
The dashboard could display drafts. It could not create them. You watched the queue and waited for a...
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I Broke My SPA Fallback by Renaming a FastAPI Parameter to Satisfy a Linter
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 1mo ago
I Broke My SPA Fallback by Renaming a FastAPI Parameter to Satisfy a Linter
The dashboard SPA fallback was returning 422 on every route that was not an API route. FastAPI kept...
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My test had a comment that said 'in memory fallback'. It wasn't.
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 1mo ago
My test had a comment that said 'in memory fallback'. It wasn't.
The test test_warmup_eval_no_flag_subprocess_exits_0 was running the real warmup eval command, no ,...
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The warmup engine that worked perfectly and did nothing
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 1mo ago
The warmup engine that worked perfectly and did nothing
The bug that broke my warmup engine was not a missing save call. That is the obvious culprit when...
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Your subprocess test is running against production state
Dev.to · Deva 🔧 Backend Engineering 1mo ago
Your subprocess test is running against production state
The comment in the test said "in memory fallback." That was wrong. The test was running the real...
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43 Tests for a Write Warmup State Machine
Dev.to · Deva 🔧 Backend Engineering 1mo ago
43 Tests for a Write Warmup State Machine
43 tests. That is what it took to be confident in a state machine that decides whether a posting...
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Three Test Levels for One CLI Subcommand
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 2mo ago
Three Test Levels for One CLI Subcommand
7 out of 7 tests pass. That number is boring and exactly correct. Adding a CLI subcommand sounds...
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Your feature flag defaults are backwards in tests
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 2mo ago
Your feature flag defaults are backwards in tests
Most test suites get feature flag isolation backwards. The instinct is to opt in to a feature when a...
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Phase 0 means zero writes. Make sure your code agrees.
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 2mo ago
Phase 0 means zero writes. Make sure your code agrees.
The phase spec said "Curve A." The code had _DEFAULT_PHASES. They were not the same thing. That gap...
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226 Is Not 344: Why pause_writes Needed a Code Field
Dev.to · Deva 🔧 Backend Engineering ⚡ AI Lesson 2mo ago
226 Is Not 344: Why pause_writes Needed a Code Field
226. That is the HTTP status code that stamps a 14 day penalty on write volume. Before P4,...
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